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1999 toyota battery keeps going down with new alternater this makes 2 alternaters and batteries

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The most likely cause if you have changed batteries and replaced the alternator is that you have something that is an electrical drw when the car is shut off.

I assume the battery goes down while the car is sitting?

If it goes down when you are driving, it is likely a different problem.

If you don't have a multimeter to check for current draw when everything is shut off, an easy test to remove the negative battery cable and let it set the time it takes to discharge.

Then hook it back up and see if you have a full battery. If it doesn't go down with the batteryt cable disconnected, you either have a short somewhere or there is something left on (like a glove compartment or trunk light) that is draining the battery.

I assume you checked for the obvious things like brake lights staying on when the car is shut off (brake light switch problem).

Posted on Oct 01, 2010

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